3 files changed, 13 insertions, 16 deletions

diff --git a/src/librustc_codegen_utils/codegen_backend.rs b/src/librustc_codegen_utils/codegen_backend.rs
index 1077c1f4263..0e2c3731eae 100644
--- a/src/librustc_codegen_utils/codegen_backend.rs
+++ b/src/librustc_codegen_utils/codegen_backend.rs
@@ -14,7 +14,7 @@ use rustc::util::common::ErrorReported;
 use rustc::session::config::{OutputFilenames, PrintRequest};
 use rustc::ty::TyCtxt;
 use rustc::ty::query::Providers;
-use rustc::middle::cstore::{EncodedMetadata, MetadataLoader};
+use rustc::middle::cstore::{EncodedMetadata, MetadataLoaderDyn};
 use rustc::dep_graph::DepGraph;
 
 pub use rustc_data_structures::sync::MetadataRef;
@@ -26,7 +26,7 @@ pub trait CodegenBackend {
     fn print_passes(&self) {}
     fn print_version(&self) {}
 
-    fn metadata_loader(&self) -> Box<dyn MetadataLoader + Sync>;
+    fn metadata_loader(&self) -> Box<MetadataLoaderDyn>;
     fn provide(&self, _providers: &mut Providers<'_>);
     fn provide_extern(&self, _providers: &mut Providers<'_>);
     fn codegen_crate<'tcx>(
diff --git a/src/librustc_codegen_utils/symbol_names.rs b/src/librustc_codegen_utils/symbol_names.rs
index 7ccd024769f..c52c6cfa83c 100644
--- a/src/librustc_codegen_utils/symbol_names.rs
+++ b/src/librustc_codegen_utils/symbol_names.rs
@@ -95,7 +95,7 @@ use rustc::ty::query::Providers;
 use rustc::ty::{self, TyCtxt, Instance};
 use rustc::mir::mono::{MonoItem, InstantiationMode};
 
-use syntax_pos::symbol::InternedString;
+use syntax_pos::symbol::Symbol;
 
 use log::debug;
 
@@ -112,7 +112,7 @@ pub fn provide(providers: &mut Providers<'_>) {
     };
 }
 
-fn symbol_name(tcx: TyCtxt<'tcx>, instance: Instance<'tcx>) -> InternedString {
+fn symbol_name(tcx: TyCtxt<'tcx>, instance: Instance<'tcx>) -> Symbol {
     let def_id = instance.def_id();
     let substs = instance.substs;
 
@@ -123,13 +123,11 @@ fn symbol_name(tcx: TyCtxt<'tcx>, instance: Instance<'tcx>) -> InternedString {
     if def_id.is_local() {
         if tcx.plugin_registrar_fn(LOCAL_CRATE) == Some(def_id) {
             let disambiguator = tcx.sess.local_crate_disambiguator();
-            return
-                InternedString::intern(&tcx.sess.generate_plugin_registrar_symbol(disambiguator));
+            return Symbol::intern(&tcx.sess.generate_plugin_registrar_symbol(disambiguator));
         }
         if tcx.proc_macro_decls_static(LOCAL_CRATE) == Some(def_id) {
             let disambiguator = tcx.sess.local_crate_disambiguator();
-            return
-                InternedString::intern(&tcx.sess.generate_proc_macro_decls_symbol(disambiguator));
+            return Symbol::intern(&tcx.sess.generate_proc_macro_decls_symbol(disambiguator));
         }
     }
 
@@ -146,23 +144,22 @@ fn symbol_name(tcx: TyCtxt<'tcx>, instance: Instance<'tcx>) -> InternedString {
     let attrs = tcx.codegen_fn_attrs(def_id);
     if is_foreign {
         if let Some(name) = attrs.link_name {
-            return name.as_interned_str();
+            return name;
         }
         // Don't mangle foreign items.
-        return tcx.item_name(def_id).as_interned_str();
+        return tcx.item_name(def_id);
     }
 
-    if let Some(name) = &attrs.export_name {
+    if let Some(name) = attrs.export_name {
         // Use provided name
-        return name.as_interned_str();
+        return name;
     }
 
     if attrs.flags.contains(CodegenFnAttrFlags::NO_MANGLE) {
         // Don't mangle
-        return tcx.item_name(def_id).as_interned_str();
+        return tcx.item_name(def_id);
     }
 
-
     let is_generic = substs.non_erasable_generics().next().is_some();
     let avoid_cross_crate_conflicts =
         // If this is an instance of a generic function, we also hash in
@@ -222,5 +219,5 @@ fn symbol_name(tcx: TyCtxt<'tcx>, instance: Instance<'tcx>) -> InternedString {
         SymbolManglingVersion::V0 => v0::mangle(tcx, instance, instantiating_crate),
     };
 
-    InternedString::intern(&mangled)
+    Symbol::intern(&mangled)
 }
diff --git a/src/librustc_codegen_utils/symbol_names/legacy.rs b/src/librustc_codegen_utils/symbol_names/legacy.rs
index cf575c54293..601a33a66bb 100644
--- a/src/librustc_codegen_utils/symbol_names/legacy.rs
+++ b/src/librustc_codegen_utils/symbol_names/legacy.rs
@@ -335,7 +335,7 @@ impl Printer<'tcx> for SymbolPrinter<'tcx> {
             self.path.finalize_pending_component();
         }
 
-        self.write_str(&disambiguated_data.data.as_interned_str().as_str())?;
+        self.write_str(&disambiguated_data.data.as_symbol().as_str())?;
         Ok(self)
     }
     fn path_generic_args(